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authorPeng Fan <Peng.Fan@freescale.com>2015-03-31 09:56:27 +0800
committerPeng Fan <Peng.Fan@freescale.com>2015-04-29 15:00:31 +0800
commitfe02c2c77fa7b29b1a073cc08ecea34af6d87fd2 (patch)
treeb8e6c74ef3d5fd18db73a19a405254334a93b76e /drivers
parent8d52c67d2680f42f21274675bb36b253a6a8d7ad (diff)
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MLK-10774-30 imx:mx7 dm thermal driver support
Add thermal driver for mx7 Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/thermal/imx_thermal.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/drivers/thermal/imx_thermal.c b/drivers/thermal/imx_thermal.c
index 4e1e412..cc355b3 100644
--- a/drivers/thermal/imx_thermal.c
+++ b/drivers/thermal/imx_thermal.c
@@ -18,6 +18,7 @@
#include <thermal.h>
#include <imx_thermal.h>
+#if defined(CONFIG_MX6)
#define TEMPERATURE_MIN -40
#define TEMPERATURE_HOT 80
#define TEMPERATURE_MAX 125
@@ -116,6 +117,78 @@ static int read_cpu_temperature(struct udevice *dev)
return temperature;
}
+#elif defined(CONFIG_MX7)
+#define TEMPERATURE_MIN -40
+#define TEMPERATURE_HOT 85
+#define TEMPERATURE_MAX 125
+#define MEASURE_FREQ 327
+
+static int read_cpu_temperature(struct udevice *dev)
+{
+ unsigned int reg, tmp, start;
+ unsigned int raw_25c, te1;
+ int temperature;
+ unsigned int *priv = dev_get_priv(dev);
+ u32 fuse = *priv;
+ struct mxc_ccm_anatop_reg *ccm_anatop = (struct mxc_ccm_anatop_reg *)
+ ANATOP_BASE_ADDR;
+ /*
+ * fuse data layout:
+ * [31:21] sensor value @ 25C
+ * [20:18] hot temperature value
+ * [17:9] sensor value of room
+ * [8:0] sensor value of hot
+ */
+
+ raw_25c = fuse >> 21;
+ if (raw_25c == 0)
+ raw_25c = 25;
+
+ te1 = (fuse >> 9) & 0x1ff;
+
+ /*
+ * now we only use single measure, every time we read
+ * the temperature, we will power on/down anadig thermal
+ * module
+ */
+ writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_clr);
+ writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_set);
+
+ /* write measure freq */
+ reg = readl(&ccm_anatop->tempsense1);
+ reg &= ~TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ_MASK;
+ reg |= TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_FREQ(MEASURE_FREQ);
+ writel(reg, &ccm_anatop->tempsense1);
+
+ writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_clr);
+ writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr);
+ writel(TEMPMON_HW_ANADIG_TEMPSENSE1_MEASURE_TEMP_MASK, &ccm_anatop->tempsense1_set);
+
+ start = get_timer(0);
+ /* Wait max 2s */
+ do {
+ reg = readl(&ccm_anatop->tempsense1);
+ tmp = (reg & TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_MASK)
+ >> TEMPMON_HW_ANADIG_TEMPSENSE1_TEMP_VALUE_SHIFT;
+ if (tmp != 0)
+ break;
+ } while (get_timer(0) < (start + 2000));
+ /* Still not get invalid temperature? */
+ if (tmp == 0)
+ return -EINVAL;
+
+ writel(TEMPMON_HW_ANADIG_TEMPSENSE1_FINISHED_MASK, &ccm_anatop->tempsense1_clr);
+
+ /* Single point */
+ temperature = tmp - (te1 - raw_25c);
+
+ /* power down anatop thermal sensor */
+ writel(TEMPMON_HW_ANADIG_TEMPSENSE1_POWER_DOWN_MASK, &ccm_anatop->tempsense1_set);
+ writel(PMU_REF_REFTOP_SELFBIASOFF_MASK, &ccm_anatop->ref_clr);
+
+ return temperature;
+}
+#endif
int imx_thermal_get_temp(struct udevice *dev, int *temp)
{
@@ -152,11 +225,23 @@ static int imx_thermal_probe(struct udevice *dev)
/* Read Temperature calibration data fuse */
fuse_read(pdata->fuse_bank, pdata->fuse_word, &fuse);
+#if defined(CONFIG_MX6)
/* Check for valid fuse */
if (fuse == 0 || fuse == ~0 || (fuse & 0xfff00000) == 0) {
printf("CPU: Thermal invalid data, fuse: 0x%x\n", fuse);
return -EPERM;
}
+#elif defined(CONFIG_MX7)
+ /* No Calibration data in FUSE? */
+ if ((fuse & 0x3ffff) == 0)
+ return -EPERM;
+
+ /* We do not support 105C TE2 */
+ if (((fuse & 0x1c0000) >> 18) == 0x6)
+ return -EPERM;
+#else
+#error "Not support thermal driver"
+#endif
*priv = fuse;